[Antennas] RE: capacitors on dipole

Fri, 7 Nov 2003 17:26:37 GMT

Hart,
If you want a better look at what a dipole with capacitive hats is, try going to www.cushcraft.com.  They have pictures and descriptions of their rotatable 40 mtr dipole and the 2 element 40 meter beam there.  I use their 3 element beam (A-3S) with the 40 meter conversion at my qth.  It also uses capacitive hats on the 40 meter section.  
You can see that the hats are made up of 4 stif wires, not just one, and are each only about 9" long, not several feet.  You will also notice the capacitive hats used on most verticals are approximately the same dimensions, also not several feet long.  
The point is, don't let people scare you off.  Do some research into how things are done by people who make their living by building antennas that work and don't be scared off by theories.

73 de Jerry, K�EJF
E.J.(Jerry) Forwood

-- "Merv Stump" <[email protected]> wrote:
Hart, I agree with Bob.  However, a couple of things I would point out.
If you drop the ends down as he suggests you will find that this antenna
is electrically short compared to what you thought it would be.  For
example, if you want the antenna to look 5 feet longer than it is, you
may have to add 6 feet if it is to be dropped down.  Secondly, if you
only need to lengthen the antenna a little bit, try using insulated
wire.  You will find that insulated wire is 2% to 3% electrically longer
than uninsulated.

Regards, Merv

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